Delay-time calculator
Every note value in milliseconds and hertz — straight, dotted and triplet — plus reverb pre-delay and decay from the same arithmetic.
How to read this
A quarter note is 60000 / BPM milliseconds. Dotted adds half again; a triplet takes two thirds. Everything on this page follows from those three facts, including the reverb block — a reverb tail is just a delay time you have stopped counting.
The dotted eighth is the one worth knowing by heart. It lands off the grid on every beat and back on it every three, which is why it fills space without competing with the snare — the reason it is the default on so many records.
The hertz column matters more than it looks. Below roughly 30 ms a delay stops being an echo and starts being a filter: at 1 ms you are notching at 500 Hz, not repeating anything. That is the comb-filtering boundary, and it is the same arithmetic that governs phase between two microphones on one source.
One caution on tempo-synced reverb: matching decay to a bar length is a starting point, not a law. A tail that fits the bar perfectly can still smear the mix if the arrangement is dense — trust what you hear over what the number says.